Abstract
We observe a long-lived solitary wave in a superfluid Fermi gas of atoms after phase imprinting. Tomographic imaging reveals the excitation to be a solitonic vortex, oriented transverse to the long axis of the cigar-shaped atom cloud. The precessional motion of the vortex is directly observed, and its period is measured as a function of the chemical potential in the BEC-BCS crossover. The long period and the correspondingly large ratio of the inertial to the bare mass of the vortex are in good agreement with estimates based on superfluid hydrodynamics that we derive here using the known equation of state in the BEC-BCS crossover.
- Received 27 February 2014
DOI:https://doi.org/10.1103/PhysRevLett.113.065301
© 2014 American Physical Society
Viewpoint
Solitons with a Twist
Published 4 August 2014
Two independent groups have shown that certain defects in superfluids can be identified as solitonic vortices.
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